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Magnetic and magnetoelectric properties of self-assembled Fe Mn O nanocrystals

ACS Applied Materials and Interfaces, ISSN: 1944-8244, Vol: 3, Issue: 9, Page: 3589-3593
2011
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Article Description

We report magnetoresistance of -40%, corresponding to 80% spin polarization, at magnetic field of 0.5 T and 200 K for oleic acid-coated Fe Mn O nanocrystals (FMO NCs) self-assembled on a SiO /Si substrate by drop casting fabrication. The FMO NCs exhibited spin glass transition around 150 K and nonlinear current-voltage (I-V) characteristics. Fowler-Nordheim plot of the I-V characteristics indicated that electrons tunnel directly barriers between the FMO NCs. Transmission electron microscopy revealed that the FMO NCs are elongated hexagon in shape with size of ∼15 × 20 nm. The FMO NCs self-assembled in two-dimension hexagonal networks of collinear ferromagnetic moments. The [111] easy magnetization axis of each FMO NC was parallel to each other in the hexagonal arrays. Geometrically frustrated lattice of collinear ferromagnetic moments supports both a low and a high intergranular tunneling conductance for the self-assembled FMO NCs without and with magnetic fields, respectively. © 2011 American Chemical Society.

Bibliographic Details

Kohiki, Shigemi; Okada, Koichi; Mitome, Masanori; Kohno, Atsushi; Kinoshita, Tomoki; Iyama, Koichiro; Tsunawaki, Fumiya; Deguchi, Hiroyuki

American Chemical Society (ACS)

Materials Science

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